Piston-packing.



H. S. ROSSER.

PISTON PACKING. l APPLLCATIONy HLED ocT.2o. |917.

1,300,1 97. v 4 `Patented Apr. 8, 1919.

3 SHEETS-SHEET I.

H. s. RossER. PISTDN PACKING.

APPLICATIQN EILED OCT. 20. 1917.

Pafented'fxpr. 8,1919.

3 SHEETS-SHEET 2.

Wifi/mmm H. S. ROSSER.

PlsToN PACVKING.

APPLICATION FILED OCT-20| 1917.

1 ,3400, 1 97, Patented Apr. 8, 1919.

3 SHEETS-SHEET 3.

HORACE snossnnfor Nonronx, yxizomra/ Specification of Letters Batent.

l rammed Apr. 8,1919.

App'nationmed october 2o, i917. vf serjiai No. ionssl To all whom# may concern: .f l f Be it known thatI', Hormon -S. Ros'sE R, a citizen ofthe United Statesesiding at Nor-Iv folk, inthe county of Norfolk and State 'of Virginia, have invented new and useful' 11nprovements in4 Piston-Packings, ofwhlich the following yis a specification.

This invention relatesl to nVnewland useful improvements in packing means fordpiston rods, valve stems andthe like, and the principal object of the inventionis to `provide a packing which will reducethe leakageupast v the stem to a'minimuml and at thesame time willnot 'be 'easily broken .andi` willhave the.

maximum lwearing qualities.

Another'object of the invention jis tofo'rm a' packing having" a l combination of alloy and cast iron 4of Vproper proportions, 'so that alloy will actas an antifriction metal and prevent undue wear to piston rod stem. The cast iron is to prevent unduewear to alloy,

strengthen segmentsl `and reinforce'lapsto prevent breakage.

A further object of the invention is to make the packing of a plurality of segments, provided with overlapping portions, :and to so locate the inserts that the said laps are strengthened thereby. i

Another object of the invention is tok provide a device of this character which is simple and durable in construction, reliable and efficient in operation and one which can be manufactured and placed upon .the market at a minimum cost.

The invention also consists in certain kother features of construction and in the combina@ tion and arrangementof the severalparts,

to be hereinafter fully described, illustrated 'in the accompanying' drawings and specifi.-Vr cally pointed out in the appendedk claims.

In describingl my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding p-artsthroughout the sevf eral views, and in which Figure 1 is alongitudina'l section of a stufl'ing box embodying my invention.4

Fig. 2 is a front view of the, segmental packing assembled but -with the springs omitted.

Fig. 3 is a part side view thereof showing the laps.

Figs. 4, 5 and 6 are plate.

Fig. 7 is a front view of the pushring.`

details of the cover forcing. the segments thereof .together and 110 shows ra'fpair ofca'st ironinserts.

Fig. E9 is a front, viewjo'f the; s forV holding the parts assembled:

is represented at 1', this rod beingsurrounded pli-@Wing Y HIn Figi 1 part. ofthe piston orvalveirod i by the stliliing box ycafsin,c`r1"indicated atf2 and' l containing the improvedpacking. forming the subject matter of my invention.` fflhis packingconsists of the ring?, made upof afp'luralfityv of segments 4f, threefof such seg- Y ments being 'shownjinf the drawings. .At

the meeting endsjsa'd segments are provided with overlapping Vportions 5, .as shownin Figs and 3, and said overlappingendsare covered by cover "plate 6. This Acover" p` late recesses; 8 formed on:y one of the' s egments whereby Asaid'"coverplate issecu'red to one segment'butfhas slldlng movement on the OtherfSQgmGnt-...The projecting lugs 7 may c be. of square formation or 'may have an finlinedfrontface. In this manner the recess 1 8 is separated from the cut-away `portion at theejndof the segment. I form a pair of vslots 10 4in. the outer.. face of the cover plate which are adapted to receive the split prefer to .form a recess 13 in the -outer pevided with a dowel slot'14 in its rear face,

substantially mid-way,` of its ends, and these slots are adapted to receivethe wedge'shaped lugs V15 projecting fromthe push ring 16 which engagesthe said rear facel ofthe seg-l ments. Anextension 17 is formed on the. opposite face ofsaid `ring which is adapted to receivethe coil spring 18 which is compressedfbetween saidpush ring and the 'end of theV casing. Thus .the segmental ring is hield- -against the front of the casing" ask clearly shown in Fig. 1. After-.the parts are assembled the springs 11. are placed around lthe saine'and said so y circularf' springs 11 which holds the parts in assembled position. Y The outer edges of the cover plate 'areinclined as at A12 and I 85 y springs are seated in .fthegrooves 10 of the cover plates, thus said springs tend to reduce the ldiameter of the segmental ring by thus cause said "ring v.to grip the rod.

In carrying out my invention I prefer to form each segmentof an alloy,vsuch as a mixture of copper, tin and lead, combined with cast iron inserts. These insertsY are indicated by the reference numeral 20 and I prefer to provide these inserts with openings 21 on both sides and to machine them and then the alloy is cast around them. I so position the two inserts vthat the end of one of them will project into one of the laps of the segment at one end while the end of the other-insert will project into the lap at the other end of the segment so as to strengthen said laps. It will be seen that the inserts are-so located that the inner peripheries are exposed and will come in contact Vwith the rod, said inserts being arranged one infront of the other but spaced apart so that the alloy is between them.

My improved die casted alloy packing with cast iron ring inserts is so designed as to make all the joints steam tight with a suiiicient amount of lap to allow for long wear before it is necessary to adjust the segments and said packing will act as an antil frictionY meansto prevent excessive wear of the piston rod.v The iron inserts will prevent vundue wearto the alloy and by having their ends projecting into the laps, the said laps are prevented from breaking.

It is thought from the foregoing description that the advantages and novel features of my invention will be readily apparent.

I desire it to be understood that I may make slight changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

What I claim is l. A packing of the class described comprising a body composed of an alloy and a pair of cast iron rings in said body spaced apart, said body and rings made up of segments having overlapping ends, the end of one ring projecting` into the lap at one end of the body and the other ring into the lap at the other end.

2. -A packing of the class described comprising a ring made up of segments having overlapping ends, one end of each segment having a recess therein adapted to receive a lug on one side of a cover plate, the other end of said cover plate having sliding engagement with the other segment and each of saidsegments havinga slot in its rear face for engagement with a lug on a push ring. v

In testimony whereof I affix my signature.

HORACE S. ROSSER.

Copies of this ptent'may be obtained'for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

